/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation

extension TimeInterval {
  static func days(_ quantity: Double) -> TimeInterval {
    return hours(24) * quantity
  }
  
  static func hours(_ quantity: Double) -> TimeInterval {
    return minutes(60) * quantity
  }
  
  static func minutes(_ quantity: Double) -> TimeInterval {
    return 60 * quantity
  }
}

extension Date {
  func at(_ hours: Int, minutes: Int = 0) -> Date {
    return Calendar.current.date(bySettingHour: hours, minute: minutes, second: 0, of: self)!
  }

  func next() -> Date? {
    let calendar = Calendar.current
    let dayComponents = calendar.dateComponents([.month, .day], from: self)
    return calendar.nextDate(after: Date(), matching: dayComponents, matchingPolicy: .nextTime)
  }
}
